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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/file_util.h"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <libgen.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <sys/mman.h>
#define _DARWIN_USE_64_BIT_INODE // Use 64-bit inode data structures
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include <fstream>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/eintr_wrapper.h"
#include "base/file_path.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "base/time.h"
namespace file_util {
#if defined(GOOGLE_CHROME_BUILD)
static const char* kTempFileName = "com.google.chrome.XXXXXX";
#else
static const char* kTempFileName = "org.chromium.XXXXXX";
#endif
bool AbsolutePath(FilePath* path) {
char full_path[PATH_MAX];
if (realpath(path->value().c_str(), full_path) == NULL)
return false;
*path = FilePath(full_path);
return true;
}
// TODO(erikkay): The Windows version of this accepts paths like "foo/bar/*"
// which works both with and without the recursive flag. I'm not sure we need
// that functionality. If not, remove from file_util_win.cc, otherwise add it
// here.
bool Delete(const FilePath& path) {
const char* path_str = path.value().c_str();
struct stat file_info;
int test = stat(path_str, &file_info);
if (test != 0) {
// The Windows version defines this condition as success.
bool ret = (errno == ENOENT || errno == ENOTDIR);
return ret;
}
if (!S_ISDIR(file_info.st_mode))
return (unlink(path_str) == 0);
return (rmdir(path_str) == 0);
}
bool PathExists(const FilePath& path) {
struct stat file_info;
return (stat(path.value().c_str(), &file_info) == 0);
}
bool PathIsWritable(const FilePath& path) {
FilePath test_path(path);
struct stat file_info;
if (stat(test_path.value().c_str(), &file_info) != 0) {
// If the path doesn't exist, test the parent dir.
test_path = test_path.DirName();
// If the parent dir doesn't exist, then return false (the path is not
// directly writable).
if (stat(test_path.value().c_str(), &file_info) != 0)
return false;
}
if (S_IWOTH & file_info.st_mode)
return true;
if (getegid() == file_info.st_gid && (S_IWGRP & file_info.st_mode))
return true;
if (geteuid() == file_info.st_uid && (S_IWUSR & file_info.st_mode))
return true;
return false;
}
bool DirectoryExists(const FilePath& path) {
struct stat file_info;
if (stat(path.value().c_str(), &file_info) == 0)
return S_ISDIR(file_info.st_mode);
return false;
}
bool ReadFromFD(int fd, char* buffer, size_t bytes) {
size_t total_read = 0;
while (total_read < bytes) {
ssize_t bytes_read =
HANDLE_EINTR(read(fd, buffer + total_read, bytes - total_read));
if (bytes_read <= 0)
break;
total_read += bytes_read;
}
return total_read == bytes;
}
// Creates and opens a temporary file in |directory|, returning the
// file descriptor. |path| is set to the temporary file path.
// Note TODO(erikkay) comment in header for BlahFileName() calls; the
// intent is to rename these files BlahFile() (since they create
// files, not filenames). This function does NOT unlink() the file.
int CreateAndOpenFdForTemporaryFile(FilePath directory, FilePath* path) {
*path = directory.Append(kTempFileName);
const std::string& tmpdir_string = path->value();
// this should be OK since mkstemp just replaces characters in place
char* buffer = const_cast<char*>(tmpdir_string.c_str());
return mkstemp(buffer);
}
bool CreateTemporaryFileName(FilePath* path) {
FilePath directory;
if (!GetTempDir(&directory))
return false;
int fd = CreateAndOpenFdForTemporaryFile(directory, path);
if (fd < 0)
return false;
close(fd);
return true;
}
FILE* CreateAndOpenTemporaryShmemFile(FilePath* path) {
FilePath directory;
if (!GetShmemTempDir(&directory))
return NULL;
return CreateAndOpenTemporaryFileInDir(directory, path);
}
FILE* CreateAndOpenTemporaryFileInDir(const FilePath& dir, FilePath* path) {
int fd = CreateAndOpenFdForTemporaryFile(dir, path);
if (fd < 0)
return NULL;
return fdopen(fd, "a+");
}
bool CreateTemporaryFileNameInDir(const std::wstring& dir,
std::wstring* temp_file) {
// Not implemented yet.
NOTREACHED();
return false;
}
bool CreateNewTempDirectory(const FilePath::StringType& prefix,
FilePath* new_temp_path) {
FilePath tmpdir;
if (!GetTempDir(&tmpdir))
return false;
tmpdir = tmpdir.Append(kTempFileName);
std::string tmpdir_string = tmpdir.value();
#ifdef ANDROID
char* dtemp = NULL;
#else
// this should be OK since mkdtemp just replaces characters in place
char* buffer = const_cast<char*>(tmpdir_string.c_str());
char* dtemp = mkdtemp(buffer);
#endif
if (!dtemp)
return false;
*new_temp_path = FilePath(dtemp);
return true;
}
bool CreateDirectory(const FilePath& full_path) {
std::vector<FilePath> subpaths;
// Collect a list of all parent directories.
FilePath last_path = full_path;
subpaths.push_back(full_path);
for (FilePath path = full_path.DirName();
path.value() != last_path.value(); path = path.DirName()) {
subpaths.push_back(path);
last_path = path;
}
// Iterate through the parents and create the missing ones.
for (std::vector<FilePath>::reverse_iterator i = subpaths.rbegin();
i != subpaths.rend(); ++i) {
if (!DirectoryExists(*i)) {
if (mkdir(i->value().c_str(), 0777) != 0)
return false;
}
}
return true;
}
bool GetFileInfo(const FilePath& file_path, FileInfo* results) {
struct stat file_info;
if (stat(file_path.value().c_str(), &file_info) != 0)
return false;
results->is_directory = S_ISDIR(file_info.st_mode);
results->size = file_info.st_size;
return true;
}
FILE* OpenFile(const std::string& filename, const char* mode) {
return OpenFile(FilePath(filename), mode);
}
FILE* OpenFile(const FilePath& filename, const char* mode) {
return fopen(filename.value().c_str(), mode);
}
int ReadFile(const FilePath& filename, char* data, int size) {
int fd = open(filename.value().c_str(), O_RDONLY);
if (fd < 0)
return -1;
int ret_value = HANDLE_EINTR(read(fd, data, size));
HANDLE_EINTR(close(fd));
return ret_value;
}
int WriteFile(const FilePath& filename, const char* data, int size) {
int fd = creat(filename.value().c_str(), 0666);
if (fd < 0)
return -1;
// Allow for partial writes
ssize_t bytes_written_total = 0;
do {
ssize_t bytes_written_partial =
HANDLE_EINTR(write(fd, data + bytes_written_total,
size - bytes_written_total));
if (bytes_written_partial < 0) {
HANDLE_EINTR(close(fd));
return -1;
}
bytes_written_total += bytes_written_partial;
} while (bytes_written_total < size);
HANDLE_EINTR(close(fd));
return bytes_written_total;
}
// Gets the current working directory for the process.
bool GetCurrentDirectory(FilePath* dir) {
char system_buffer[PATH_MAX] = "";
if (!getcwd(system_buffer, sizeof(system_buffer))) {
NOTREACHED();
return false;
}
*dir = FilePath(system_buffer);
return true;
}
// Sets the current working directory for the process.
bool SetCurrentDirectory(const FilePath& path) {
int ret = chdir(path.value().c_str());
return !ret;
}
#if !defined(OS_MACOSX)
bool GetTempDir(FilePath* path) {
const char* tmp = getenv("TMPDIR");
if (tmp)
*path = FilePath(tmp);
else
*path = FilePath("/tmp");
return true;
}
bool GetShmemTempDir(FilePath* path) {
#if (defined(OS_LINUX) && !defined(ANDROID)) || defined(OS_HURD)
*path = FilePath("/dev/shm");
return true;
#else
return GetTempDir(path);
#endif
}
bool CopyFile(const FilePath& from_path, const FilePath& to_path) {
int infile = open(from_path.value().c_str(), O_RDONLY);
if (infile < 0)
return false;
int outfile = creat(to_path.value().c_str(), 0666);
if (outfile < 0) {
close(infile);
return false;
}
const size_t kBufferSize = 32768;
std::vector<char> buffer(kBufferSize);
bool result = true;
while (result) {
ssize_t bytes_read = HANDLE_EINTR(read(infile, &buffer[0], buffer.size()));
if (bytes_read < 0) {
result = false;
break;
}
if (bytes_read == 0)
break;
// Allow for partial writes
ssize_t bytes_written_per_read = 0;
do {
ssize_t bytes_written_partial = HANDLE_EINTR(write(
outfile,
&buffer[bytes_written_per_read],
bytes_read - bytes_written_per_read));
if (bytes_written_partial < 0) {
result = false;
break;
}
bytes_written_per_read += bytes_written_partial;
} while (bytes_written_per_read < bytes_read);
}
if (HANDLE_EINTR(close(infile)) < 0)
result = false;
if (HANDLE_EINTR(close(outfile)) < 0)
result = false;
return result;
}
#endif // !defined(OS_MACOSX)
} // namespace file_util
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